I have misfires that I can't figure out. My truck was running good when I parked it the night before. When I started it the following day it threw a multicylinder miscode. I changed the plugs and it didn't help. I changed the spider fuel injectors and it was now only misfiring on cylinder 7. I took it in for a scan and was told it was the plugs, plug wires and distributor cap and rotor. They changed these and it ran normal then started misfiring again on cylinder 7. I then replaced the ignition coil and module but it still misfired on cylinder 7. I then replaced all the oxygen sensors. Still misfired on cylender 7. Next I replaced the fuel filter, fuel pump and sending unit. Now it quit missing on cylender 7 and started missing on cylinder 2. I checked the compression and it is good. The fuel pressure is 50/55. I was told the fuel pressure should be 60/65. Anyone have any idea what could be the problem?